Control of cooling fan by using power supply current

Details Control of cooling fan by using power supply current Control of cooling fan by using power supply current

1993-11-02

1997-01-28

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361103, H02H 300

Patent

active

055983146

ABSTRACT:
A control system for a cooling fan in an electronic system. Power consumption (and therefore heat) is sensed by sensing power supply current. When power supply current exceeds a threshold value, the cooling fan is turned ON. In a specific embodiment, a small (low-resistance) series resistor is placed in the regulated output path of a power supply. Power supply current is measured by measuring the voltage drop across the resistor.

REFERENCES:
patent: 3659155 (1972-04-01), Chambers
patent: 4669025 (1987-05-01), Barker
patent: 4706017 (1987-11-01), Wilson

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